Experimental study of a F-, Cl-, and lithophile trace element-enriched vitrophyre from Spor Mountain, Utah

Thesis/Dissertation · Thu Jan 01 00:00:00 EST 1987

OSTI ID:5237231

Webster, J D

The phase equilibria of a vitrophyre associated with topaz rhyolite from Spor Mountain, Utah has been determined experimentally. Temperatures ranged from 485/sup 0/C to 1000/sup 0/C and pressures from 0.5 to 5 kbar. Trace element and H/sub 2/O concentrations of glasses were determined by ion microprobe; partitioning of F, Cl, Li, Be, B, Rb, Sr, Zr, Y, Nb, Ba, Cs, Ce, Th and U between Cl- and F-bearing fluids consisting of H/sub 2/O and H/sub 2/O + CO/sub 2/ was determined. Cl partitions in favor of the fluid; for F-rich melts with less than or equal to 1600 ppm Cl D/sub Cl/ (Cl fluidCl melt) ranges from 2 to 10. D/sub Cl/ increases with increasing T, P, Cl in the melt and fluid, peraluminosity of the melt, H/sub 2/O in the fluid and with decreasing F in the melt. Water saturated, peraluminous granitic melts achieve a solubility limit for Cl in the melt with 2650 +- 200 ppm Cl at 800/sup 0/C and 2 kbar. F partitions in favor of the melt; D/sub F/ ranges from 0.19 to 0.35 and decreases with decreasing T and H/sub 2/O in the fluid. Lithium, Rb, Sr, Y, Nb, Cs and Ce partition in favor of the fluid under water saturated conditions at 0.5 kbar and T greater than or equal to 900/sup 0/C; at 2 kbar Li, Rb, Y, Nb, Cs and Ce partition in favor of the fluid for T greater than or equal to 900/sup 0/C. At 4 kbar all lithophile elements studied partition in favor of the melt. D/sub i/ increases with increasing T and Cl in the system and with decreasing P and decreasing CO/sub 2/ in the fluid. Cl complexes predominantly with Li, Na, K, Rb, Cs, Fe and Ce in aqueous fluids. The enrichments in NaK, Li, Cs, Rb, Ce, Y and Nb in lavas at Spor Mountain may have resulted by transport of these elements in Cl-bearing, aqueous fluids through the F-rich magma

• Research Organization: Arizona State Univ., Tempe (USA)
• OSTI ID: 5237231
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
GEOLOGIC DEPOSITS
GEOCHEMISTRY
GLASS
MULTI-ELEMENT ANALYSIS
UTAH
CERIUM
CESIUM
CHLORINE
ENRICHMENT
FLUORINE
ION MICROPROBE ANALYSIS
IRON
LAVA
LITHIUM
MOUNTAINS
NIOBIUM
POTASSIUM
PRESSURE DEPENDENCE
RUBIDIUM
SODIUM
SOLUBILITY
STRONTIUM
TEMPERATURE DEPENDENCE
YTTRIUM
ALKALI METALS
ALKALINE EARTH METALS
CHEMICAL ANALYSIS
CHEMISTRY
ELEMENTS
FEDERAL REGION VIII
HALOGENS
METALS
MICROANALYSIS
NONDESTRUCTIVE ANALYSIS
NONMETALS
NORTH AMERICA
RARE EARTHS
TRANSITION ELEMENTS
USA
580400* - Geochemistry- (-1989)